Contact EPA Pacific Southwest Water Division
Pacific Southwest, Region 9
Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations
NPDES Wastewater & Stormwater Permits
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Municipal Separate Stormwater Sewer Systems (MS4) Program Audits
National Links
On this Page
- Case Studies
- Evaluation Guidance
- Arizona MS4 Program Evaluations
- California MS4 Program Evaluations
- Hawaii MS4 Program Evaluations
- Nevada MS4 Program Evaluations
- Report Summaries
- Contact Information
Program evaluations of Municipal Separate Stormwater Sewer Systems (MS4) are being conducted to determine permittee compliance with NPDES permit requirements and to evaluate the implementation status of EPA's stormwater regulations.
The program evaluations are also being conducted to evaluate the overall effectiveness of the MS4 program. This includes obtaining an overall picture of MS4 compliance, documenting positive elements of programs that may benefit other municipalities, identifying ways to improve the reporting aspects of MS4 programs, and developing guidance to assist inspectors in conducting future MS4 evaluations.
The program evaluation reports identify potential permit violations, program efficiencies, and positive attributes of each program. The reports do not represent a formal finding of violation.
The following audits (listed chronologically) have been conducted by Tetra Tech, Inc. in conjunction with state regulatory authorities through a U.S. EPA Region 9 contract.
EPA Region 9 Case Studies
EPA has developed a series of stormwater case studies to help Phase II municipal separate storm sewer systems (MS4s) get started on or improve their stormwater management programs. These case studies present additional information about notable program elements in the EPA Region 9 states of Arizona, California, and Hawaii. Each case study is a two- to three-page description of how a Phase I or Phase II community has implemented a specific aspect of its stormwater program. The case studies are organized by program area, but they do not necessarily represent all the activities that each community is undertaking to implement that minimum measure. Each case study description includes links to materials that further describe or were developed for the case study and the minimum control measure.
Municipal Separate Storm Sewer System (MS4) Program Evaluation Guidance
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The MS4 Evaluation Guide is primarily for use by NPDES authorities to evaluate the quality of Phase I and Phase II MS4 programs, for permit compliance, technical assistance, and other purposes. It can be used for comprehensive program evaluations, or for certain components. It can also be used by MS4 program managers to evaluate their own programs.
Arizona MS4 Program Evaluations
| Location | Date of Evaluation | Documents |
|---|---|---|
| Arizona Department of Transportation (ADOT) | October 25-29, 2010 | ADOT MS4 Report (PDF) (43 pp, 200K) |
| City of Mesa | Aug 25-27, 2008 | City of Mesa MS4 Report (PDF) (14 pp, 640K) |
| Industrial Interviews - Phoenix, Tempe, Mesa, Glendale, Scottsdale | Aug 25-28, 2008 | Industrial and Commercial Program Interviews (PDF) (16 pp, 92K) Appendix A (PDF) (2 pp, 53K) |
| Phoenix - City of Phoenix | October, 2001 | City of Phoenix MS4 Report (PDF) (12 pp, 157K) |
| City of Scottsdale | June, 2009 | City of Scottsdale MS4 Report (PDF) (96 pp, 4.6M) Cover Letter (PDF) (2 pp, 56K) |
| Tucson Area - Pima County, Cities of Tucson and Marana | May, 2006 | City of Tucson MS4 Report (PDF) (25 pp, 191K) |
California MS4 Program Evaluations
| Location | Date of Evaluation | Documents |
|---|---|---|
| Alameda - Cities of Dublin, Fremont, Hayward, Livermore, and Oakland | November, 2001 | Alameda County MS4 Report (PDF) (19 pp, 190K) |
| American Canyon - City of | June, 2005 | City of American Canyon MS4 Report (PDF) (8 pp, 88K) |
| Bakersfield (City of ) and Kern County | November, 2002 | City of Bakersfield-Kern County MS4 Report (PDF) (18 pp, 649K) |
| Bakersfield - City of | August, 2012 December, 2010 |
City of Bakersfield MS4 Report (PDF) (28 pp, 460K) City of Bakersfield MS4 Report (PDF) (23 pp, 200K) |
| Caltrans Districts 1-4 | October 5–7, 13–14, and 21–22, 2009 | Caltrans Districts 1-4 Final MS4 Audit Report, February 2010 (includes Appendix A) (PDF) (36 pp, 433K)
Findings of Violation and Order for Compliance, EPA Docket No. CWA-09-2011-0001 (PDF) (24 pp, 1.3MB) |
| Caltrans - District 5 | July, 2002 | Caltrans - District 5 MS4 Report (PDF) (12 pp, 169K) |
| Chico - City of | September, 2009 |
City of Chico MS4 Report (PDF) (25 pp, 199K) Transmittal memo (PDF) (2 pp, 39K) |
| Contra Costa - Cities of Antioch, Brentwood, and Oakley | March, 2005 | Contra Costa County MS4 Report (PDF) (30 pp, 274K) |
| Contra Costra - Cities of Concord, Pinole, Pittsburg, Richmond, and San Pablo | September, 2004 | Contra Costa County MS4 Report (PDF) (37 pp, 386K) |
| Contra Costa - Cities of Hercules and Pittsburg, Walnut Creek, and Concord, Contra Costa County, and Contra Costa Clean Water Program | May, 2003 | Contra Costa County MS4 Report (PDF) (26 pp, 192K) |
| Elk Grove - City of Elk Grove | April, 2005 August 2012 |
City of Elk Grove MS4 Report (PDF) (16 pp, 191K) City of Elk Grove MS4 Report (PDF) (64 pp, 4.0M) |
| Fresno - Cities of Fresno and Clovis, and the Fresno Metropolitan Flood Control District (District) | January, 2005 | Fresno MS4 Report (PDF) (20 pp, 186K) |
| Fresno - Cities of Fresno and Clovis, and the Fresno Metropolitan Flood Control District (District) | February, 2010 | Fresno MS4 Report (PDF) (18 pp, 151K) MFCD's Response to EPA (PDF) (11 pp, 600K) |
| Indio (City of) | August, 2012 | Indio MS4 Report (PDF) (14 pp,365K) City of Indio Response (PDF) (2 pp, 52K) |
| Kern County Storm Water Management Program | August, 2012 | Kern County MS4 Report (PDF) (27 pp, 566K) Kern County Response (PDF) (17 pp, 1.1M) |
| Lake Elsinore (City of ) MS4 program | July, 2015 | City of Lake Elsinore MS4 Report (PDF) (12 pp, 359K) City of Lake Elsinore Response (PDF) (25 pp, 3.6MB) |
| Lake Tahoe - City of South Lake Tahoe, El Dorado County and Placer County | June, 2002 July, 2009 |
Lake Tahoe MS4 Report (PDF) (13 pp, 154K) Lake Tahoe MS4 Report (PDF) (24 pp, 106K) |
| Long Beach - City of Long Beach | August, 2001 | City of Long Beach MS4 Report (PDF) (19 pp, 262K) |
| Long Beach - Port of Long Beach and Los Angeles More information |
November, 2007 | Ports of Long Beach & Los Angeles MS4 Report (PDF) (42 pp, 2.9MB) Port of Long Beach Response (PDF) (26 pp, 2.6MB) |
| Los Angeles SUSMP - LA County and Cities of Glendale, Los Angeles, and Santa Monica Standard Urban Stormwater Mitigation Measures (SUSMP) | March, 2003 | LA SUSMP Report (PDF) (63 pp, 503K) |
| Los Angeles Construction Program - Cities of Calabasas, Carson, Glendora, Pomona and Santa Clarita | August, 2006 | Los Angeles Construction Program (PDF) (31 pp, 168K) |
| Los Angeles - Port of Long Beach and Los Angeles More information |
November, 2007 | Ports of Long Beach & Los Angeles MS4 Report (PDF) (42 pp, 2.9MB) City of Los Angeles Response (PDF) (3 pp, 83K) |
| Modesto - City of Modesto | February, 2004 August, 2012 |
City of Modesto MS4 Report (PDF) (11 pp, 154K) City of Modesto MS4 Report (PDF) (10 pp, 54K) |
| Monterey - City of Monterey | September, 2009 | City of Monterey MS4 Report (PDF) (20 pp, 154K) Cover Memo MS4 Report (PDF) (2 pp, 24K) |
| Murrieta - City of Murieta | September, 2007 January, 2008 |
City of Murrieta MS4 Report (PDF) (13 pp, 427K) |
| Napa - City of Napa | June, 2005 | City of Napa MS4 Report (PDF) (9 pp, 53K) |
| Orange, City of | July, 2014 | City of Orange MS4 Report (PDF) (18 pp, 1.8MB) |
| Orange County and Cities of Laguna Beach, Laguna Hills, Lake Forest, Rancho Santa Margarita | May, 2005 | Orange County MS4 Report (PDF) (34 pp, 308K) |
| Orange County and Cities of Mission Viejo, San Clemente, and San Juan Capistrano | June, 2003 | Orange County MS4 Report (PDF) (31 pp, 292K) |
| Orange, County of | July, 2014 | Orange County MS4 Report (PDF) (31 pp, 2MB) Orange County Response (PDF) (4 pp, 620K) |
| Oxnard - City of Oxnard | July, 2013 | City of Oxnard MS4 Report (PDF) (32 pp, 1.9M) City of Oxnard Response (PDF) (7 pp, 332K) |
Petaluma - City of Petaluma | June, 2005 | City of Petaluma MS4 Report (PDF) (7 pp, 78K) |
| Riverside - Cities of Corona, Moreno Valley and Riverside. | May, 2004 | Riverside (Corona, Moreno Valley and Riverside) MS4 Report (PDF) (21 pp, 280K) |
| Riverside - County | August, 2014 | Riverside County MS4 Report (PDF) (15 pp, 373K) Riverside County Response (PDF) (5 pp, 140K) |
| Sacramento - County of Sacramento | August, 2012 |
Sacramento County MS4 Report (PDF) (110 pp, 14MB) Sacramento County Response (PDF) (30 pp, 1.4M) |
| Sacramento - County of Sacramento and the Cities of Folsom, Galt, and Sacramento | March, 2002 | Sacramento County MS4 Report (PDF) (25 pp, 309K) |
| Salinas - City of Salinas | July, 2003 June, 2014 |
City of Salinas MS4 Report (PDF) (17 pp, 188K) City of Salinas MS4 Report (PDF) (20 pp, 1 MB) |
| San Bernardino - Cities of Fontana and Redlands and San Bernardino County | October, 2004 | City of Fontana MS4 Report (PDF) (12 pp, 160K) City of Redlands MS4 Report (PDF) (13 pp, 165K) San Bernardino County MS4 Report (PDF) (14 pp, 170K) |
| San Diego - Cities of Carlsbad, Chula Vista, and El Cajon. Review of Jurisdictional Urban Runoff Management Programs (JURMPs) | May, 2002 | San Diego MS4 Report (PDF) (21 pp, 209K) |
| San Diego - Cities of Encinitas, Lemon Grove, Poway, and Santee | April, 2004 | San Diego 5 MS4 Report (PDF) (20 pp, 204K) |
| San Diego - Cities of Escondido, National City, Oceancide | February, 2003 | San Diego 3 MS4 Report (PDF) (23 pp, 237K) |
| San Diego - Cities of Imperial Beach, La Mesa, San Marcos, and Vista | October, 2003 | San Diego 4 MS4 Report (PDF) (31 pp, 338K) |
| San Diego - City of San Diego, County of San Diego | October, 2002 | San Diego City MS4 Report (PDF) (17 pp, 195K) San Diego County MS4 Report (PDF) (15 pp, 177K) |
| San Diego SUSMP - Cities of San Diego, Carlsbad, Lemon Grove, Chula Vista, Oceanside, National City, Poway, El Cajon, Escondido and San Diego County. Review of Jurisdictional Urban Runoff Management Programs (JURMPs) | March, 2005 | SUSMP Report (PDF) (53 pp, 399K) |
| San Diego - Cities of Solana Beach, Coronado, and Del Mar and Port of San Diego | November, 2004 | San Diego 6 (PDF) (20 pp, 241K) |
| San Mateo - County of San Mateo and Cities of South San Francisco, Foster City, Pacifica, Redwood City, and San Mateo | August, 2002 | San Mateo (PDF) (25 pp, 169K) |
| Santa Ana, City of | July, 2014 | Santa Ana MS4 Report (PDF) (17 pp, 2.3MB) |
| Santa Clara - Cities of Milpitas, Palo Alto, Santa Clara, and Santa Clara County | April, 2005 | Santa Clara MS4 Report (PDF) (23 pp, 171K) |
| Santa Clara - City of San Jose and County of Santa Clara | December, 2003 | Santa Clara - SanJose MS4 Report (PDF) (19 pp, 270K) Monitoring evaluation report (PDF) (11 pp, 55K) |
| Santa Clara - City of San Jose and County of Santa Clara | December, 2003 | Santa Clara - SanJose MS4 Report (PDF) (19 pp, 270K) Monitoring evaluation report (PDF) (11 pp, 55K) |
| Santa Paula - City of Santa Paula | July, 2013 November, 2014 |
City of Santa Paula MS4 Report (PDF) (26 pp, 882K) Administrative Order on Consent (PDF) (1 pp, 153 K) |
| Simi Valley - City of Simi Valley | July, 2013 | City of Simi Valley MS4 Report (PDF) (36 pp, 1.1M) City of Simi Valley Response (PDF) (12 pp, 596K) |
| Stockton - City of Stockton and San Joaquin County | December, 2002 | Stockton-San Joaquin MS4 Report (PDF) (16 pp, 182K) |
| Stockton - Port of Stockton | July, 2008 | Port of Stockton MS4 Report (PDF) (88 pp, 16MB, scanned) Port of Stockton AOC (PDF) (28 pp, 1.2MB, scanned) |
| Temecula | September, 2007 January, 2008 |
City of Temecula MS4 Report (PDF) (37 pp, 3.5MB, scanned) |
| Thousand Oaks - City of Thousand Oaks | July, 2013 | City of Thousand Oaks MS4 Report (PDF) (32 pp, 1.2M) City of Thousand Oaks Reponse (PDF) (20 pp, 704K) |
| Ventura County Flood Control District and the Cities of Ojai, Oxnard, Santa Paula, and Simi Valley | October, 2001 | Ventura MS4 Report (PDF) (18 pp, 143K) |
| Ventura County Watershed Protection District | July, 2013 | Ventura County VCWPD (PDF) (22 pp, 667K) Ventura County VCWPD Response (PDF) (14 pp, 770K) |
| Ventura SQUIMP - Cities of Fillmore, Moorpark, Port Hueneme, Ojai, Oxnard, Santa Paula, Simi Valley, the County of Ventura, and the Ventura County Watershed Protection District. Storm Water Quality Storm Water Quality Urban Impact Mitigation Plan (SQUIMP) requirements | August, 2004 | Ventura MS4 Report (PDF) (26 pp, 1.3 MB) |
Hawaii MS4 Program Evaluations
| Location | Date of Evaluation | Documents |
|---|---|---|
| Honolulu/HDOT | October, 2003 September, 2004 March, 2009 |
Honolulu HDOT MS4 Report (PDF) (21 pp, 1.6 MB) Honolulu HDOT MS4 Report (PDF) (11 pp, 232K) HDOT Harbors Division, MS4 Report (PDF) (58 pp, 4.2MB) |
| Honolulu, City and County of | September, 2013 |
City and County of Honolulu MS4 Report (PDF) (219 pp, 22.6 MB) |
Nevada MS4 Program Evaluations
| Location | Date of Evaluation | Documents |
|---|---|---|
| Nevada Department of Transportation MS4 Audit | August, 2011 | NDOT MS4 Report (PDF) (261 pp, 12.8MB) NDOT Response to Audit (PDF) (6 pp, 552K) |
| Las Vegas Area: Clark County, Clark County Regional Flood Control District, and Cities of Las Vegas, North Las Vegas, and Henderson | September, 2005 | Las Vegas MS4 Report (PDF) (207 pp, 20MB) Final Appendices (PDF) (164 pp, 20MB) Follow-up Letter from EPA (PDF) (5 pp, 215K) |
| Reno - Cities of Reno and Sparks, Washoe County and the Nevada Department of Transportation (NDOT) | January, 2002 | Reno MS4 Report (PDF) (12 pp, 293K) City of Reno Response July 3 2002 (PDF) (12 pp, 800K) |
Report Summaries
Tetra Tech's summary of work performed to assess stormwater compliance in California, as well as a discussion of lessons learned and recommendations for improvement of stormwater program.
| Document | Date |
|---|---|
| Assessment Report on California Industrial Stormwater Program (PDF) (41 pp, 678K) | July 12, 2006 |
| Assessment Report on California MS4 Program (PDF) (28 pp, 773K) | July 12, 2006 |
Contact Information
Ellen Blake (blake.ellen@epa.gov)
Office of Water Compliance and Enforcement
(415) 972-3496